java.util.zip
Class ZipOutputStream

java.lang.Object
  java.io.OutputStream
      java.io.FilterOutputStream
          java.util.zip.DeflaterOutputStream
              java.util.zip.ZipOutputStream

All Implemented Interfaces:

java.util.zip.ZipConstants

Direct Known Subclasses:

JarOutputStream

public class ZipOutputStream

extends DeflaterOutputStream

implements java.util.zip.ZipConstants

This class implements an output stream filter for writing files in the ZIP file format. Includes support for both compressed and uncompressed entries.

Field Summary

static int	CENATT
static int	CENATX
static int	CENCOM
static int	CENCRC
static int	CENDSK
static int	CENEXT
static int	CENFLG
static int	CENHDR
static int	CENHOW
static int	CENLEN
static int	CENNAM
static int	CENOFF
static long	CENSIG
static int	CENSIZ
static int	CENTIM
static int	CENVEM
static int	CENVER
static int	DEFLATED Compression method for compressed (DEFLATED) entries.
static int	ENDCOM
static int	ENDHDR
static int	ENDOFF
static long	ENDSIG
static int	ENDSIZ
static int	ENDSUB
static int	ENDTOT
static int	EXTCRC
static int	EXTHDR
static int	EXTLEN
static long	EXTSIG
static int	EXTSIZ
static int	LOCCRC
static int	LOCEXT
static int	LOCFLG
static int	LOCHDR
static int	LOCHOW
static int	LOCLEN
static int	LOCNAM
static long	LOCSIG
static int	LOCSIZ
static int	LOCTIM
static int	LOCVER
static int	STORED Compression method for uncompressed (STORED) entries.

Fields inherited from class java.util.zip.DeflaterOutputStream

buf, def

Fields inherited from class java.io.FilterOutputStream

out

Constructor Summary

ZipOutputStream(OutputStream out)
Creates a new ZIP output stream.

Method Summary

void	close() Closes the ZIP output stream as well as the stream being filtered.
void	closeEntry() Closes the current ZIP entry and positions the stream for writing the next entry.
void	finish() Finishes writing the contents of the ZIP output stream without closing the underlying stream.
void	putNextEntry(ZipEntry e) Begins writing a new ZIP file entry and positions the stream to the start of the entry data.
void	setComment(String comment) Sets the ZIP file comment.
void	setLevel(int level) Sets the compression level for subsequent entries which are DEFLATED.
void	setMethod(int method) Sets the default compression method for subsequent entries.
void	write(byte[] b, int off, int len) Writes an array of bytes to the current ZIP entry data.

Methods inherited from class java.util.zip.DeflaterOutputStream

deflate, write

Methods inherited from class java.io.FilterOutputStream

flush, write

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

STORED

public static final int STORED

Compression method for uncompressed (STORED) entries.

See Also:

Constant Field Values

DEFLATED

public static final int DEFLATED

Compression method for compressed (DEFLATED) entries.

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Constant Field Values

LOCSIG

public static final long LOCSIG

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Constant Field Values

EXTSIG

public static final long EXTSIG

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Constant Field Values

CENSIG

public static final long CENSIG

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ENDSIG

public static final long ENDSIG

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LOCHDR

public static final int LOCHDR

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EXTHDR

public static final int EXTHDR

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CENHDR

public static final int CENHDR

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ENDHDR

public static final int ENDHDR

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LOCVER

public static final int LOCVER

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LOCFLG

public static final int LOCFLG

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LOCHOW

public static final int LOCHOW

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LOCTIM

public static final int LOCTIM

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LOCCRC

public static final int LOCCRC

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LOCSIZ

public static final int LOCSIZ

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LOCLEN

public static final int LOCLEN

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LOCNAM

public static final int LOCNAM

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LOCEXT

public static final int LOCEXT

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Constant Field Values

EXTCRC

public static final int EXTCRC

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EXTSIZ

public static final int EXTSIZ

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EXTLEN

public static final int EXTLEN

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Constant Field Values

CENVEM

public static final int CENVEM

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Constant Field Values

CENVER

public static final int CENVER

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Constant Field Values

CENFLG

public static final int CENFLG

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CENHOW

public static final int CENHOW

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CENTIM

public static final int CENTIM

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Constant Field Values

CENCRC

public static final int CENCRC

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Constant Field Values

CENSIZ

public static final int CENSIZ

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CENLEN

public static final int CENLEN

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CENNAM

public static final int CENNAM

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CENEXT

public static final int CENEXT

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CENCOM

public static final int CENCOM

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CENDSK

public static final int CENDSK

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CENATT

public static final int CENATT

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CENATX

public static final int CENATX

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CENOFF

public static final int CENOFF

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ENDSUB

public static final int ENDSUB

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ENDTOT

public static final int ENDTOT

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ENDSIZ

public static final int ENDSIZ

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ENDOFF

public static final int ENDOFF

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ENDCOM

public static final int ENDCOM

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Constant Field Values

Constructor Detail

ZipOutputStream

public ZipOutputStream(OutputStream out)

Creates a new ZIP output stream.

Parameters:

out - the actual output stream

Method Detail

setComment

public void setComment(String comment)

Sets the ZIP file comment.

Parameters:

comment - the comment string

Throws:

IllegalArgumentException - if the length of the specified ZIP file comment is greater than 0xFFFF bytes

setMethod

public void setMethod(int method)

Sets the default compression method for subsequent entries. This default will be used whenever the compression method is not specified for an individual ZIP file entry, and is initially set to DEFLATED.

Parameters:

method - the default compression method

Throws:

IllegalArgumentException - if the specified compression method is invalid

setLevel

public void setLevel(int level)

Sets the compression level for subsequent entries which are DEFLATED. The default setting is DEFAULT_COMPRESSION.

Parameters:

level - the compression level (0-9)

Throws:

IllegalArgumentException - if the compression level is invalid

putNextEntry

public void putNextEntry(ZipEntry e)
                  throws IOException

Begins writing a new ZIP file entry and positions the stream to the start of the entry data. Closes the current entry if still active. The default compression method will be used if no compression method was specified for the entry, and the current time will be used if the entry has no set modification time.

Parameters:

e - the ZIP entry to be written

Throws:

ZipException - if a ZIP format error has occurred

IOException - if an I/O error has occurred

closeEntry

public void closeEntry()
                throws IOException

Closes the current ZIP entry and positions the stream for writing the next entry.

Throws:

ZipException - if a ZIP format error has occurred

IOException - if an I/O error has occurred

write

public void write(byte[] b,
                  int off,
                  int len)
           throws IOException

Writes an array of bytes to the current ZIP entry data. This method will block until all the bytes are written.

Overrides:

write in class DeflaterOutputStream

Parameters:

b - the data to be written

off - the start offset in the data

len - the number of bytes that are written

Throws:

ZipException - if a ZIP file error has occurred

IOException - if an I/O error has occurred

finish

public void finish()
            throws IOException

Finishes writing the contents of the ZIP output stream without closing the underlying stream. Use this method when applying multiple filters in succession to the same output stream.

Overrides:

finish in class DeflaterOutputStream

Throws:

ZipException - if a ZIP file error has occurred

IOException - if an I/O exception has occurred

close

public void close()
           throws IOException

Closes the ZIP output stream as well as the stream being filtered.

Overrides:

close in class DeflaterOutputStream

Throws:

ZipException - if a ZIP file error has occurred

IOException - if an I/O error has occurred